Where do you live where you have cold days, but hot nights? Lol.
Anyways, we all know that heat is one of the main contributors to degredation. But, if it was covered and shielded from the sun/rain for only 3 days, I would say that it is fine.. If it looks/feels how it should, I don't see any reason why it would be destroyed. If anything maybe the outer coating is slightly degraded, but unlikely.. Why don't you just chop it up and see how it breaks up? It's not like it is going to just change into some toxic poison after 3 days..